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Industry power supply 48V manufacturers show you how to reduce the voltage noise of switching power supplies


Industry power supply 48V manufacturers tell you that many power supplies will be a little noisy when working. Next, I will analyze them for you.

Industry power supply 48V manufacturers tell you that many power supplies will be a little noisy when working. Next, I will analyze them for you:

Best Industry power supply 48V Manufacturers china
The first method that can effectively improve the output voltage noise of switching power adapters is that engineers can use a combination of chip three-terminal capacitors and ordinary electrolytic capacitors at the output of the adapter to improve the high-frequency characteristics of the filter. Industry power supply 48V manufacturers tell you that before introducing the specific operation mode of this method, we need to first understand why the adapter has noise voltage peaks. Without any additional measures, the output of the adapter will often contain large noise voltage peaks due to the imperfect characteristics of electrolytic capacitors at high frequencies. Because electrolytic capacitors can be equivalent to the series connection of capacitors, resistors and inductors at high frequencies, the bypass effect of capacitors on noise is not obvious at high frequencies. Due to the existence of resistance and inductance, the noise voltage is reflected in the output end of the switching power adapter.
After understanding the cause of the output noise peak, in order to better suppress the output noise of the switching power adapter, there are usually two methods that can be used by product developers. The first method is to disassemble the electrolytic capacitors at the output end into several parts, that is, a large-capacity electrolytic capacitor is replaced by several small-capacity electrolytic capacitors in parallel. Industry power supply 48V manufacturers tell you that although this suggestion cannot fundamentally suppress the generation of noise voltage, the peak-to-peak value of signal noise voltage generated by the new method is smaller than the original. The second method is to connect a small-capacity high-frequency ceramic capacitor in parallel next to the electrolytic capacitor, and use the low capacitive reactance of the high-frequency capacitor at high frequencies to greatly attenuate the output noise voltage. Capacitors should also keep trace lengths relatively short, keeping the trace impedance as low as possible.
The second method that can effectively improve the output voltage noise of switching power adapters is that engineers can use high-performance surface-mount filters to improve the noise peaking situation. Industry power supply 48V manufacturers tell you that the internal circuit of the mounted filter can be equivalent to a π-type filter circuit, and a mounted high-performance filter is connected to the output end of the switching power adapter, which will greatly reduce the peak value of the output noise compared to the original. Small, in the test, the noise voltage peak is almost displayed as a straight line on the oscilloscope, which shows that the noise of the output voltage has been significantly suppressed, thus a good illustration of the role of the surface mount high-performance filter in this line.

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